I always seem to be losing phoenix connectors.

I want to buy a bag of them to keep in the office as spares.

Are all phoenix connectors of the same size cross compatible ? Eg. could the same phoenix connector be used on a Lutron keypad, a multi zone audio amp ? (as long as they fit in the slot)

No they are not all the same size. There are multiple pitches available.

What i meant is, if i have one of the same size are they cross compatible, or do they have other technical spec which needs to be checked before using it with a device, eg. voltage. etc.

Sorry misread you post ... To the best of my knowledge pitch is your only concern.

This was the moment to ask OP if pitch was the only criterion he's looking at.

I did a couple of jobs outside the US and found when purchasing parts metric-pitched products exist, probably in more than one pitch, perhaps 1 mm and 1.25 mm. And there's the other, American or Imperial units.


EDIT:
Of course, if they are THE SAME SIZE, then the pitch will be the same; the size of wire gauge that can be accommodated will be the same; the maximum amperage will be the same. "Same size" means cross compatible, unless... just what do you mean by cross compatible?

They are, yes. Even across different brands.

There may be other variables on some. For example, I recently had some same size phoenix connectors that I tried to use for an amplifier that a client owned and the previous company did not leave all of them in. I found some in my stash but they had a plastic guide on the bottom and they wouldnt fit in the amp because of this. I guess I could have tried to trim it off but it was the first time I recall seeing something like that so I kept them intact.

"Phoenix" is a brand name. The connector is usually referred to as a Euroblock connector. Other manufactures make similar connecters (Wago, Molex, Hosa).

This site should help:

[Link: prosoundtraining.com]

If you find a connector which mates properly, it may have markings at each terminal that don't correspond with what you're plugging into. For example they might be 1-2-3-4 on the chassis connector but 4-3-2-1 on the plug. Or one may have Tx-Rx-V-G printed on it and the mating connector may have R+ R- L- L+.

Just don't get me started on 2-conductor round power connectors found on the ends of plug-in power supplies. No thought is given to the polarity, the voltage, the amperage, or whether it's AC or DC.